Feign handling unparameterized ResponseEntity

fixes gh-612

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/support/ResponseEntityDecoder.java

@@ -5,8 +5,6 @@ import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 import java.util.LinkedList;
 
-import lombok.extern.slf4j.Slf4j;
-
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.util.LinkedMultiValueMap;
@@ -15,6 +13,7 @@ import org.springframework.util.MultiValueMap;
 import feign.FeignException;
 import feign.Response;
 import feign.codec.Decoder;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Decoder adds compatibility for Spring MVC's ResponseEntity to any other decoder via
@@ -34,19 +33,30 @@ public class ResponseEntityDecoder implements Decoder {
 	public Object decode(final Response response, Type type) throws IOException,
 			FeignException {
 
-		if (type instanceof ParameterizedType
-				&& ((ParameterizedType) type).getRawType().equals(ResponseEntity.class)) {
-
+		if (isParameterizeResponseEntity(type)) {
 			type = ((ParameterizedType) type).getActualTypeArguments()[0];
 			Object decodedObject = decoder.decode(response, type);
 
 			return createResponse(decodedObject, response);
 		}
+		else if (isResponseEntity(type)) {
+			return createResponse(null, response);
+		}
 		else {
 			return decoder.decode(response, type);
 		}
 	}
 
+	private boolean isParameterizeResponseEntity(Type type) {
+		return type instanceof ParameterizedType
+				&& ((ParameterizedType) type).getRawType().equals(ResponseEntity.class);
+	}
+
+	private boolean isResponseEntity(Type type) {
+
+		return type instanceof Class && type.equals(ResponseEntity.class);
+	}
+
 	@SuppressWarnings("unchecked")
 	private <T> ResponseEntity<T> createResponse(Object instance, Response response) {
 

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/feign/valid/FeignClientTests.java

@@ -48,6 +48,8 @@ import org.springframework.cloud.netflix.ribbon.RibbonClient;
 import org.springframework.cloud.netflix.ribbon.StaticServerList;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.web.bind.annotation.RequestHeader;
@@ -110,6 +112,12 @@ public class FeignClientTests {
 
 		@RequestMapping(method = RequestMethod.GET, value = "/hellos")
 		HystrixCommand<List<Hello>> getHellosHystrix();
+
+		@RequestMapping(method = RequestMethod.GET, value = "/noContent")
+		ResponseEntity noContent();
+
+		@RequestMapping(method = RequestMethod.HEAD, value = "/head")
+		ResponseEntity head();
 	}
 
 	@FeignClient(serviceId = "localapp")
@@ -179,6 +187,16 @@ public class FeignClientTests {
 			return params;
 		}
 
+		@RequestMapping(method = RequestMethod.GET, value = "/noContent")
+		ResponseEntity noContent() {
+			return ResponseEntity.noContent().build();
+		}
+
+		@RequestMapping(method = RequestMethod.HEAD, value = "/head")
+		ResponseEntity head() {
+			return ResponseEntity.ok().build();
+		}
+
 		public static void main(String[] args) {
 			new SpringApplicationBuilder(Application.class).properties(
 					"spring.application.name=feignclienttest",
@@ -259,6 +277,20 @@ public class FeignClientTests {
 		assertEquals("hellos didn't match", hellos, getHelloList());
 	}
 
+	@Test
+	public void testNoContentResponse() {
+		ResponseEntity response = testClient.noContent();
+		assertNotNull("response was null", response);
+		assertEquals("status code was wrong", HttpStatus.NO_CONTENT, response.getStatusCode());
+	}
+
+	@Test
+	public void testHeadResponse() {
+		ResponseEntity response = testClient.head();
+		assertNotNull("response was null", response);
+		assertEquals("status code was wrong", HttpStatus.OK, response.getStatusCode());
+	}
+
 	@Data
 	@AllArgsConstructor
 	@NoArgsConstructor